JAJSGC8B October 2018 – January 2020 TPS25982
PRODUCTION DATA.
The TPS25982 implements Undervoltage Protection on IN to turn off the output in case the applied voltage becomes too low for the downstream load or the device to operate correctly. The Undervoltage Protection has a default internal threshold of VUVP. If needed, it is also possible to set a user defined Undervoltage Protection threshold higher than VUVP using the UVLO comparator on the EN/UVLO pin. Figure 42 and Equation 1 show how a resistor divider from supply to GND can be used to set the UVLO set point for a given voltage supply level.
The resistors must be sized large enough to minimize the constant leakage from supply to ground through the resistor divider network. At the same time, keep the current through the resistor network sufficiently larger (20x) than the leakage current on the EN/UVLO pin to minimize the error in the resistor divider ratio.